Fall arrest harness

Abstract

A fall arrest harness comprises a pair of shoulder straps, a pair of leg straps and a rear section extending therebetween, a lanyard connection member being connected to a sternal or chest region of the shoulder straps, the rear section defining a seat portion, adapted to lie across the sub-pelvic region or seat of the wearer, and a back portion, adapted to overlie at least a portion of the back of the wearer, the shoulder straps extending between side regions of the seat portion, preferably adjacent a lower edge thereof, and an upper region of the back portion, whereby the wearer, when suspended in the harness by the lanyard connection member, lies in a supine position with the weight of the wearer supported by the seat portion and back portion of the rear section and the shoulder straps with no load being borne by the leg straps.

Claims

1. A fall arrest harness for arresting the fall of a wearer of the harness working at height, the harness comprising: a back portion configured to support an upper back region of a wearer and a seat portion configured to support a sub-pelvic region of the wearer; a first shoulder strap and a second shoulder strap, wherein the first and second shoulder straps are each connected to the back portion and the seat portion; a lanyard connection member disposed between the first and second shoulder straps, wherein the lanyard connection member is detachably connected to the back portion via first and second extension straps provided with a releasable material, the first and second extension straps including regions that overlie the back portion and wherein the fall arrest harness further comprises a cover member covering the regions of the first and second extension straps that overlie the back portion, the cover member being releasably secured to a rear portion of each of the first and second extension straps; first and second leg straps connected to the seat portion; and a first side strap connected to the seat portion and extending between the seat portion and the first shoulder strap and a second side strap connected to the seat portion and extending between the seat portion and the second shoulder strap; wherein each of the first and second extension straps is secured at a first end to a respective one of the first and second shoulder straps and at a second end to the lanyard connection member, wherein the first and second extension straps are configurable in a stowed position and an extended position, wherein the first and second extension straps are configured to extend over shoulders of the wearer proximate the back portion in the stowed position and release from the back portion in the extended position; wherein the first and second extension straps are configured to extend, automatically, to the extended position when a tensile force is applied to the lanyard connection member that exceeds a predetermined threshold tensile force, wherein the lanyard connection member separates from the back portion and portions of the first and second extension straps separate from the shoulder straps so that the lanyard connection member detaches from the back portion and suspends the wearer in a supine position with a weight of the wearer being borne by the panel and being transferred to the lanyard connection member via the first and second shoulder straps and the first and second extension straps, wherein, when the first and second extension straps are in the extended position, the lanyard connection member is along an axis that intersects the seat portion, and the first and second shoulder straps are configured to be at least partially separated from the wearer via the first and second side straps.

2. The fall arrest harness according to claim 1, wherein the first and second extension straps comprises an energy absorbing material.

3. The fall arrest harness according to claim 2, wherein the energy absorbing material is irreversibly elongated when subjected to a tensile force that exceeds a predetermined threshold tensile force.

4. The fall arrest harness according to claim 1, wherein the first and second extension straps and the lanyard connection member are detachable from the back portion via a tearable stitching or a hook and loop fastening material.

5. The fall arrest harness according to claim 1, wherein the first extension strap extends from a sternal region of the first shoulder strap and is provided with a releasable fastener, such that the first extension strap is releasably secured in contact with the first shoulder strap, and the second extension strap extends from a sterna region of the second shoulder strap and is provided with a releasable fastener, such that the second extension strap is releasably secured in contact with the second shoulder strap, whereby the first and second extension straps are attached to the first and second shoulder straps in the stowed position, distal ends of the first and second extension straps being connected to the lanyard connection member.

6. The fall arrest harness according to claim 1, wherein the first leg strap extends between a first side region of the seat portion and a central region of the seat portion and the second leg strap extends between a second side region of the seat portion and the central region of the seat portion.

7. The fall arrest harness according to claim 1, wherein the seat portion comprises a pocket for receiving a foam seat panel or padding.

8. The fall arrest harness according to claim 7, wherein the seat panel comprises a rigid material.

9. The fall arrest harness according to claim 1, wherein the seat portion comprises fabric.

10. The fall arrest harness according to claim 1, wherein the cover member is secured to the rear portion of each of the first and second extension straps by a releasable fastener.

11. The fall arrest harness according to claim 10, wherein the releasable fastener comprises a tearable stitching, or a hook and loop fastener.

12. The fall arrest harness according to claim 1, wherein the lanyard connection member is releasably attached to the back portion by press stud fasteners.

13. The fall arrest harness of claim 1 wherein the cover member comprises a unitary member that is releasably secured to the first and second extension straps.

Description

(1) An embodiment of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

(2) FIG. 1 is a front view of a fall arrest harness according to an embodiment of the present invention showing the lanyard attachment member in its stowed configuration;

(3) FIG. 2 is a rear view of the fall arrest harness of FIG. 1;

(4) FIG. 3 is a rear view of the fall arrest harness of FIG. 1 with the cover flap detached showing the extension straps in their stowed configuration;

(5) FIG. 4 is a perspective view of the harness of FIG. 1 with the extension straps and lanyard connection member in their suspended configuration, separated from the shoulder straps and back portion; and

(6) FIG. 5 is a side view of the fall arrest harness of FIG. 1 in use in its suspended configuration.

(7) As shown in the drawings, a fall arrest harness according to a preferred embodiment of the present invention comprises a main panel 1 formed from a textile material to which a plurality of strap means are secured by stitching. The main panel defines a seat portion 2 adapted to overlie the seat or sub-pelvic region of the wearer and a back portion 3 adapted to overlie the back of the wearer. A pair of shoulder straps 4,5 extend between the top of the back portion 3 and the side regions of the seat portion 2 adjacent the lower edge of the seat portion 2. The shoulder straps 4,5 are provided with a buckle arrangement 6,7 to permit each shoulder straps 4,5 to be uncoupled to fit the harness to a wearer and to permit the length of each shoulder strap 4,5 to be varied to obtain the required fit. Such buckle arrangements are well known in harness construction and need not be described in more detail.

(8) A pair of side straps 8,9 extend between side regions of the back portion 3 and lower regions of respective shoulder straps 4,5 to prevent a wearer from falling out of the sides of the harness.

(9) First and second cross straps 10,11 having releasable connectors therein extend between the shoulder straps 4,5 across the torso of the wearer to prevent the shoulder straps 4,5 from migrating off the wearer's shoulders during normal movement. For added comfort the upper, and possibly also the lower, cross strap 10,11 may be formed from an elastic material.

(10) A pair of leg straps 12,13 are attached to the seat portion 2 extending between side regions of the seat portion 2 and a central region of the seat portion 2. Each leg strap 12,13 is provided with a buckle arrangement 14,15 to permit the leg straps 12,13 to be uncoupled to fit the harness to a wearer and to permit the length of the leg straps 12,13 to be varied to obtain the required fit. Unlike known fall arrest harnesses, the leg straps 12,13 are merely intended to locate the harness on the wearer and form no part in the load bearing function of the harness when a person is suspended from the harness, as will be described below.

(11) A pair of elongate extension straps 16,17 extend from upper portions of the shoulder straps 4,5 from a position adjacent the buckles 6,7, such position being level with the chest of the wearer in use. The distal ends of the extension straps 16,17 terminate in a lanyard connection member 18 in the form a triangular metal loop or D-ring for the attachment of a lanyard.

(12) The extension straps 16,17 and the upper regions of the shoulder straps 4,5 are releasably secured to the shoulder straps 4,5 in a stowed configuration by means of tearable securing means, such as preferentially tearable stitching or portions of hook and loop fastening material 20 (such as that sold under the Registered Trade Mark Velcro). When in such stowed configuration, the extension straps 16,17 extend onto the back portion 3 of the main panel 1 and are secured thereto by the tearable securing means 20, whereby the lanyard connection member 18 is located at a dorsal position such that the lanyard connected thereto does not interfere with the work being carried out by the wearer.

(13) A cover flap 21 is provided, attached at one end to the back portion of the main panel, said cover flap 21 being releasably secured to said extension straps 16,17 and or back portion 3. A further retention flap 22 provided with hook and loop fastening material 20 is located on the back portion 3 to extend through the lanyard connection member 18 to hold the lanyard connection member 18 in the desired dorsal location during the normal activities of the wearer.

(14) Thus the harness may be comfortably worn during the normal working activities of the wearer whilst connected to a safety lanyard without interfering in the movement or activities of the wearer.

(15) In the event of a fall, the tension applied to the lanyard connection member 18 by the lanyard causes the lanyard connection member 18 and the associated extension straps 16,17 to gradually separate from the back panel 3 and the shoulder straps 4,5 until the extension straps 16,17 and lanyard connection member 18 reach a suspended configuration, as shown in FIG. 5, wherein the wearer is suspended in a supine position with the weight of the wearer borne by the seat portion 2 and back portion 3 of the main panel 1 and transferred to the lanyard connection member 18 via the shoulder straps 4,5 and the extension straps 16,17.

(16) Because the wearer is suspended in a supine position with the wearer's weight supported by the broad main panel 1, no weight is transferred through the leg straps 12,13 and thus no pressure is placed on the inside thigh and/or groin area, as occurs in prior art harnesses where leg straps are used to support the weight of the wearer. Thus the venous system of the legs is not restricted and the onset of suspension trauma is greatly delayed, or even avoided.

(17) Furthermore, the spreading of the wearer's weight over the area of the main panel 1 avoids pressure concentrations that occur with prior art strap arrangements and, combined with the supine position, provide greater comfort and reduced stress for the wearer when suspended by the lanyard connection member 18 of the harness.

(18) The use of tearable securing means 20 on the extension straps 16,17, cover flap 21 and retention flap 22, and in particular the releasable attachment of the extension straps 16,17 to the shoulder straps 4,5 and back portion 3 over substantially the entire length of the extension straps 16,17, effectively absorbs the shock of the initial arrest of the fall by the lanyard.

(19) Furthermore, the strength of the tearable securing means 20 can be optimised to provide a gradual guided release of the extension straps 16,17 and lanyard connection portion 18 between its stowed and suspended configurations and thus a controlled and guided movement of the wearer between uncontrolled fall and the supine suspended position.

(20) To provide further resistance to the separation of the extension straps 16,17 from the shoulder straps 4,5 during the final separation of the extension straps 16,17 from the shoulder straps 4,5, cover flaps 23,24 may be provided on the shoulder straps 4,5 adapted to overlie the extension straps 16,17, the cover flaps 23,24 being provided with hook and loop fastening material 20 to releasably secure the cover flaps 23,24 to the extension straps 16,17.

(21) To further absorb the decelerative force applied to the wearer by the harness in the event of a fall, the extension straps 16,17 are formed from an energy absorbing material whereby the straps are adapted to deform or partially tear or include weakly stitched separable regions such that the straps irreversibly elongate when exposed to a tensile force beyond a predetermined level.

(22) To further increase the comfort of the wearer when suspended by the harness, the set portion 2 may be provided with a pocket 25 within which can be located a padded seat panel formed, for example, from a closed cell polymeric foam material.

(23) Various modifications and variations to the described embodiments of the inventions will be apparent to those skilled in the art without departing from the scope of the invention as defined in the appended claims. Although the invention has been described in connection with specific preferred embodiments, it should be understood that the invention as claimed should not be unduly limited to such specific embodiments.

(24) For example, a single extension strap may be provided extending between the shoulder straps, possibly attached to a cross strap extending between the shoulder straps, to a detachable connection means provided at a dorsal location on the rear section of the harness. Also it is envisaged that releasable fastening means other than hook and loop fastening means might be utilised to releasably attach the lanyard connection member to the dorsal location and/or the one or more extension straps to the other portions of the harness. The various strap portions may be connected to the rear section of the harness such that the material of the rear section is load bearing or the strap portions (in particular the shoulder straps) may be continuous and extend over the length of the rear section.

(25) The connection between the shoulder straps 4,5 and the respective side straps 8,9 may be provided by a ring or similar linking means to which the straps are connected.

(26) Various modifications and variations to the described embodiment of the invention will be apparent to those skilled in the art without departing from the scope of the invention as defined in the appended claims. Although the invention has been described in connection with a specific preferred embodiment, it should be understood that the invention as claimed should not be unduly limited to such specific embodiment.